./mutagen -p 68 -t 1 -p 37
terminate called after throwing an instance of 'std::invalid_argument'
  what():  stoul
Aborted (core dumped)

./mutagen -p 68 -t 1 -f 37
=======================================
== Mutagen Puzzle Solver by Denevron ==
=======================================
Starting puzzle: 68 (68-bit)
Target HASH160: e0b8a2baee...7451fc8cfc
Base Key: 0x730FC235C1942C1AE
Flip count: 37 (override, default was 34)
Total Flips: 21912870037044995008
Using: 1 threads
Progress: 0.000000%
Processed: 10000000
Speed: 4.75 Mkeys/s
Elapsed Time: 00:00:17